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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13434d15d43b70822d941df95ee1cf75484b2fa686a1e833a3b482d6768a7c0' 
  AND token = '03ElIPPnebQ7ixTaGdRyzTFcP7STZZCJlQNaYFgAm5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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