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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfc775d7725f457ed9a4b65384c636bf0248e9a93e3a6f4ab1f140f7e23578c3' 
  AND token = 'odPLfHX4b/PHlMJU6H/v4rUQyoHb9wrpUMK7dQDDTak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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