SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7326ac4d7d5ffc7fb725c5048b23c66eea9e197cb3d4ea91a0930db690f4b7f' 
  AND token = 'vMKBD3vKPhjS5I2h/XxXY2FT6DbHpgg+Xaodzvw38oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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