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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff58046f6dc8fc857a60552e0f2abb808e7cd2fe204c4b6c62f393bb5a09c31' 
  AND token = '3lqOpoShPpbBRzKO7Zj7qfApcSYxboe3k83Nnr6HSTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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