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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf5fc12079ec5726356bd9ea1688d575947cca89c25eeaa31852085748d1cc0' 
  AND token = 'MDzHXRYSBV1vjEtAsi/Qq3z1qmANfpoVC2Y9A7T5r+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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