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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c698b7fe1dd60721b978edaf2b7853b0267a4cf96ec43f0e5e90cc26c477089e' 
  AND token = '+El55xGzeDFWnBdcDeUqnLJXNWR6TL6c06yZgdnAz/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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