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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994404f79d1c5e645983e486b8b3e97371325a1e33ab27b1d1eb10bf5ce71ae7' 
  AND token = 'Ht02RUCrg1gCYdT2sBXVE8otOGeoffR5hGXXeYQ4qm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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