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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd091d0535979ee0379945154cf8cd4f824d66c15b9ac193a32428cb77d7a3acd' 
  AND token = 'TuoU3+hVhxeqni0o99cM7T5xYccTKqOqRm59OGMTas4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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