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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b072814ae01c1ffdeaedc90540b5bd04d0b8ecec06004cbf5a996bb8b252bf' 
  AND token = 'igi+W3S8xslVv02u40/Xa2sevIh8j21l8rfHUl1j/2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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