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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5bd55cb4166fbeb704cd7c8b948fd0073b1409942e36b4848dab4475ba59172' 
  AND token = 'Ow9/CLRoJsrbgOs8mUugRnSBUBuVIay+hazSJeTL5eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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