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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1083a84569bf9e0ff5c5ca5e3b0f025bcff8707a327f82ba43d0e365403e5c04' 
  AND token = 'AJNyt8FDGiZnLwdKnUUaiJxmcA57S+Doh61Xja5SNtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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