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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c9c96d37c5c04f0229b6384754e7ea5dc253a5e8266af66d87831a4fed860f' 
  AND token = 'N7cNu6kQzU6j+ywAsVbvAtqs5c8j3ZYJvfMxaw17oug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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