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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a952bd2e86089ce5e91d4990da54dd99eaf82fefa7e0742731625f14cecf42' 
  AND token = 'avEwNTAQTfPuX/f9ZOyiCpVju4+48ghWWQeoF4GM2G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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