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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3de93070e279163dc7a3d9c19030007e7ae4c1584f0c50957ef2c07fd87cc11' 
  AND token = 'PGUny20RRecAaoZXvhW/iPRhFkYMPeM/MqWepTndrZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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