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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f629c92c73db9735033c72b2ad90490ac4bcd644e417ce17e81989aa13121388' 
  AND token = 'TpkmuPFM+yiRWtV2dWmMSVSffWqjnO+8CFapdJrQV9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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