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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b5318568691c45f0068c5b749394749c39c83d1663fd82eb3c7ffa636b5cda' 
  AND token = 'o89e3Nvl76jjAHTABbiX/zRFDwAHbvChrlACpI+vz4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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