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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a4ab656c158b927b65fc87edd736913fc448df0adb04674b8b7a603fdbfa49' 
  AND token = '2AtE6m522XdjsNAlYYkWUBwhYa1F5yAguQcQMZEChW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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