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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f9de9f0b726ff7b3f584302561ea3ef67f5de3c6a59e95bd2875220966b4df' 
  AND token = 'xgAjN9oX5TBREZAVGw1BfEIxYHuvyGxw32xXrvd/0Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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