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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83ecc9cfc5015657aa1ac857c383456a7e20006b916414499a054a7d6f98d88' 
  AND token = 'FALILsamt39V6aYaBrt4IyyoYLaQg0ejfden79og/wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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