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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009159c288cbb7c902d3a4953d49781d38d2f63690a228a83552f6d34a15eb07' 
  AND token = 'BA7ElIIS8M//chW6DLN/U/EimKWzkag9OI/P41UR39c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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