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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f358c1190d5bbb94adfb66345cd1adc08b7733e25db721a8f68ffb30ac88b136' 
  AND token = 'D1AdrrwjB8mPCLrjnTGs2ZDCaNlRCq3kmfnp1KvyFZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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