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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '243f0424a1d60aa2ba459bac5bc7f81d1e77f7b3850635092876ea32db320dda' 
  AND token = '1DXw5rCbNSV369J5CB5k3oJ6vGrfvPEkK4887yirkj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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