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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885c1c781ff76a00746be8b1f37b915d9ac6df99cde7af6f6815461aa3f52544' 
  AND token = 'l6hwL3vj/dACaQkYoPrt309QnfgO823HE/RT3fYKtBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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