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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd9df67d45a3783665bdbe8dcba03b6783552a78344a3abcd7f5e1a6f64e91a' 
  AND token = 'UWQjKF79AgM3d6yzllvuhBSx0Cd3Qv9XpnTRKTw20Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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