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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a34114dd3dec9fcc7aeb7a4743b6118fe0680b1de4df2785c1e3834a3f54262' 
  AND token = 'ngMIlZz53oBDikFQ7mJG8woA4TGcr+WEiSzal70Rgkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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