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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0affceed47aab5bdb3cae0532f3f912f8cd4c85b8bf3da247f2d70525b8891f' 
  AND token = 'xf0wGAUarK8etdn4BDON7cDCLuo6Xql4HhiGZ6rHR5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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