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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e734da200f57f84cbb30fa80cda44e8663b2d7d508f8cb95976569e356efdd3' 
  AND token = '3eGILJLqka6OrYfq0rtob78IR00Rxmh5Uc7JEQAErK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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