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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f360fce9c265c79d7cdd156acb89aadf552c725b9c865bfaaf54b2e3bc1cad' 
  AND token = '9TH5Hr5Vx3rk7mixJ1BIp5/JZGBiyDOQYc7Y1kocbK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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