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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5dd5727f9747ef1c50bd6ed9c7d1c9e48edef0ae3175e828b7c9ea64b60077c' 
  AND token = 'HkRzyYZ4OLwp09rHfh7UOfUq0/N0p0sf3irA2WZduQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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