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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bd4255cb8efbaba1244cea0e97260feee12501b96f73a4c70316b257f5b8b7' 
  AND token = '3xDfcfdo4QuOil9/9jjRIGHsIPxP1R3RzoW+/HSMtqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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