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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca92994ef7dd0398f30834bb0aa5af457187ad11a4e9a4af1a50e8df615e3309' 
  AND token = '46E/rWv2uHsOGvB0UEQ5TFq7mXlIAnTDXMYYgfXLuyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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