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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '319dacebf3277f803120cd8c8aa233606dc0a8a5ae63dbbb189fa5218ed4a70d' 
  AND token = 'KlEKpsSQDc46JErwgmMWmjyJPCt9WURyLgfTg6BH7YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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