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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '867d3bd30b55d355b2f10d2730fea021e42bac575281f63de09a8cf47499463f' 
  AND token = 'IWzLQG/58UsHwNcSb1ypm2fTzgdHw/F/BlyFzdsm0LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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