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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5748db37a4a86facd24b36ef1fc7971e4811b5f776bbb4881f49dd108207f04' 
  AND token = '1/kWZNxtT3RabIsOgz4rNMazm7B3ZTNweN7xQO362xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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