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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '899a37a0c3816f10db4ab78a78748a8ab6ce20881e785d5f46653c842f6bce81' 
  AND token = 'jJy59rZNpzDA41eq6TDp9/gousRVvbmY7zzFdw7xbxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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