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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b483a960c1ae27e39ee5e7eb85c35b6c745b8bb5c1c175cd21692bcf61db4b18' 
  AND token = 'GfrfP7nwoLfX7s38EqP+MmeOlBdrbBAe82NirN0wx5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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