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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '228659e21dbb6adf48852224c390c15de8f2bc43c604c8e02be69426cc1c29cd' 
  AND token = 'iKsX8GswMCHc2DyUg/9dfQ3kbXI63ffNGi33+eX53+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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