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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e4a908602d4691190a4fe7f42ed08b49fee2c995b964eecd7d5cdc30fb4a293' 
  AND token = 'pjpWoZs0NM2XlXASBSEOYVnNO/bB8CdTwmVLlQ2JtSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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