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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7285cae6513d002f8a7c5c0a38a287b97259d2b90a3204af8a7ed8e9f488335e' 
  AND token = 'VXycsrZiiHnPEyzAu8qL2XKrOI9wS5WRSf0a97FKyEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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