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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94d81e33af3eac83b55139ce56c6358b9c5b9791fd52e66f7e21d05e4ab535f' 
  AND token = 'uL82r34b3hENDvvVaaQo3IdXdr8P6MU4WOxQCRoFH2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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