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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ae82ea07b2099e80f92609a618411fe2ad257f4b4936322dddad8b81cee91b' 
  AND token = '4FUQ3jy2AxuUEwnqy8Kc1QgsoyFl1WWoclRRhd0EXLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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