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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6cf4e924ff3c858fd0edd01f7f04ee68815b8086718a26e0a03859a6eed57e' 
  AND token = 'b1jHoiNqFt+lkYfkSiUCDSP4AzlQRQlMl5FqAXsH0p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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