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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba83fed9b6cac19cc72e8f240cd4917481c3f50078c06267e33dbdb697f3e95' 
  AND token = 'Ml6YS8NEHUgKD/rb8syFfi+J7f7qfljEfT9wq3ta0FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}