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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba38ebedd06d2c4fcbedfe283c03bef7aa8166b7ff1fa88b720880839fc42e46' 
  AND token = '+p84fcyXY5RwN1Phr7HJofy6dVmocuQoEPkG8HoWN4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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