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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dad7b5e6fe2d2d291ee464568eabb9446fe03c7bbc73d34ea66dcf865b8704f' 
  AND token = 'm9zJo7Kt8GMEu4OkXcAM9wvHi5xTAJiHsLKj6o8ZIi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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