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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7e89ffd35207c1f7dacef5919659b3817bcb14438ee8d1e80faca6cf8f7cc1' 
  AND token = 'Ht5v+T9t7dhXTm6imu5mz5f+ylTkMeOpoI9IG+pIl1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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