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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ededb6efbbae384b4b962fd5173b12fd398619a26d2d75cdf22b72898b65a375' 
  AND token = 'qJzWwQEY9o5lwwEeh6LnHYv0OVAEbOxkThVpp9grU84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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