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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679ac625e5f391f3daff10aceb42a1bb1fa3ad1105efcd34c0dd816520081e2e' 
  AND token = 'Yau8LADNCUUfZTmEr7tUNQuyynH9jN/uBFw6f5asjeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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