SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3364fb899c794b06ab69ec78c0a5e9316a64b2f76da02c90cdd7f48467240b2' 
  AND token = 'zG/ribSTtoSKshDKpK3Pd+nqwBFP5t05cKYzvfDL9YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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