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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44aa2189f9ee1f2f1f843bb7346f5fa1ba32e43718635e5cd937db3480d4da92' 
  AND token = 'qDkoOGwAP4yJU7AKmwdfhwXAb13fsqqF5lMg/QW0xkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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