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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '527c7570f507a3a1856b470ce0a03b8e8a8052395ba990dbb6fbfe6b87524ea3' 
  AND token = 'CsbUbYb1noJeo96QQDwEwJLNlsDYeKZBsPg2Gxexs4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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