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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4d408ea83ae0a175b70b8883a2fb48766dd80d97dddac0af45c260b8d41e36' 
  AND token = 'qJDr7jcLp1P5dUl/aJmWkEh3Gs573N6WFFR76/DvPQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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