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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eccb6845fc944e327a7ad776870a8617b3c6d469848f4234f8c10d60e5d1f491' 
  AND token = 'Um5L86mC4VBW6uiNVMdZB01Vd7derRv5alM2BjwXKtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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