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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c907c0de1cc12d2dc4db3d68b5d5a3bf8c98c6c6cba69507e93139bcfacf4a9b' 
  AND token = 'rZe84K70kQ2d0QTfLLpLCas818XhFf5TbbWu3vc/mXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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