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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f2a4030c3e8c7d2b77876ec42066d634793c04704c452ce8c00182fcd34cc9' 
  AND token = 'f5erqZqJvr2EEWvFMl2tt2E/hhmtsqM+E4odQpuF5GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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