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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f72c02cd17aa981a8cc550dd5ab77ec674ab980173b74230bb34f877aa42c23' 
  AND token = 'oyQPtxaadej3v8Dbebmgahkl3Op6e95VdHWPoHQr1zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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