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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5eaedcc1c8d2ffff6f4e5be4696b185da1a5c788fde4f31560ad15f3fd4fc7' 
  AND token = 'hqKRbnWWj4pvARxznLAqhEXwrX4X6BMXTM5FVuFrx8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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