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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8031f88ffa098f001d219ffa7502f9db9bc08a1b883f964961548960f75519b6' 
  AND token = 'HA4dsJViwMpdJW7iCsR9rDFXlL483YYdYZLLX9CJ50M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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