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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9018a0e0bf58df51283a7ed2e8f99e9319cbdfc4401dfcd55d3a862bd33602' 
  AND token = 'Mwcu6ovwXbryct0Rq8pCZ8c9dD6HKorvg/FLSqw4ARg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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