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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42f6b8a25aa8082f8eb3f1541ea03582909bfa19208bd58af8a49f5e5d802e4f' 
  AND token = 'rcy/Z4S2WesNKzOzRjSh3uwVOpiAFoVLAE/U5zavSXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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