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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32eda41e9ddbd832d84afb826bc6ffc741e8ca3d81590d9f311400bf811e0125' 
  AND token = 'sDIQQM4wR+RIOarp9w4ARC7i67D7/jh3L63uWiuWvLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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