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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036cfd80a9280173eea751c58b73b336efc038aea45848cb6117ff5c6fe578e4' 
  AND token = 'KUxrNph1VLXm5pkcRV1zmszpADgW5acgXt/m+jPDKM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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