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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb6c9f08b96f7ef319097847bab05a4f85965b4af0f7e244ad46efba8029c3d' 
  AND token = 'EVN28jFs7QGS6Yuy+DhXX+9rP/E5/F6HRIKWIr7sIj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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