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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5553b7e654b77bea71b2c4bcd73caf5aae8b76762924a14d83ea0dedd996a47' 
  AND token = 'Y7A4gyJQVzc3PtLQzyV54VnqsOaoTNMJDkgTi5zDg24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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