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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3575a4bec9d4d037e775b7e8a1f0b7392d231959fd87bf26dc0423fd94ac8ad3' 
  AND token = 'JEwBjH2BML9QdwCL/gDeNuiPY4G36aAa/ffwSJZ8BYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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