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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23551f34ce41d6093350536c9f627309a16ba47a43c982fa46924a409961701' 
  AND token = 'LK2lafof61akUv9q4kf10Je5gVysLBcMALfa4ZPDKeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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