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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650a21b1f63794ce157d8fba54363a759344f65d7504472ccdc6878a8600f7f3' 
  AND token = 'jy3XP3N9wVMCCZM84xH+B43f2GkGO9KG2SXiTYkCWf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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