Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b473731596325df1aa884d47aad4d40754cdae63c91222625f039638405e5285' 
  AND token = '+z/DNAiUx51/To7kSA3nmn1rguQaXTxZpDkmXcalqNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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